Spark plug



Feb. 17, 1925. 1,527,106

E.. N. ALCOCER ET AL SPARK 'PLUG Filed Oct. s 1922 a m zg WITNESSES IIVVE/VTOR a Q0087 fvfi/ ATTORNEYS Patented Feb. 17, 1925.

UNITED STATES.

' 1 1,527,106 PATENT OFFICE.

EUGENIO N. ALCOCER AND FRANCISCO O. ALQOCER, OF MEXICO, MEXICO.

SPARK PLUG.

Application filed October 3, 1922. Serial No. 592,103.

To all whom it may concern:

Be it known that we, EUGENIO N. ALoo- GER and FRANCISCO O. Anooonn, citizens of Mexico, and residents of Mexico, D. F. Mexico, have invented a new and Improved Spark Plug, of which the following is a full, clear, and exact description.

This invention has relation to ignition devices and has particular reference to a spark plug for igniting the charge in in ternal combustion engines.

The primary object of the present inven tion is to provide a spark plug which in eludes separable members capable of being readily assembled or disassembled for the purpose of repair or replacement of parts which have become worn, broken or otherwise unfit for use, without the necessity of entirely discarding the plug.

Another object of the irivention resides in the-provision of a spark plug which insures the proper insulation of the elements; which will resist sudden atmospheric changes; which will be stroke proof, and which is further provided with cooling means for minimizing the heating of the parts by conduction.

As a further object the invention contemplates a spark plug which includes adjustable electrodes whereby the spark gap may be varied and in which the electrodes are so constructed as to minimize the formation and adherence of carbon thereto.-

With the above recited and other objects in view, the invention residesin the novel construction set forth in the following speci-' fication, particularly pointed out in the appended claims and illustrated in'the accompanying drawing, it being understood that the right is reserved to embodimentsother than those actually illustrated herein to the full extent indicated by the general meaning of the terms in which the claims are expressed.

In the drawing- Figure 1 is a side view of a spark plug constructed in accordance with the invention.

Fig. 2 is a longitudinal sectional view therethrough taken approximately on the line 2-2 of Fig. 3. I

Fig. 3 is a transverse "sectional View taken approximately on the line 3-3 of Fig. 2.

Fig. 4 is an end view of the same.

Fig. 5 is a transverse sectional view taken on the line 5-5 of Fig. 2.

Referring to the drawing by characters of reference, the spark plug includes an outer member in the form of a tubular shell 10 which is provided adjacent one end with a multifaced enlargement 11 having an interiorly and exteriorly threaded annular extension 12. The outer threads designated at 13 are designed to engage in the spark plug opening of the cylinder by employing a wrench in connection with the multifaced enlargement 11 The function of the interior threads 14 will be hereinafter set forth. The upper portion of the shell 10 is provided with exterior spiral cooling flanges lf) for the purpose of reducing to a minimum heat caused by conduction from the cylinder. The upper end of the shell is interiorly threaded as at 16 to receive the threaded portion of a closure cap 17. The interior of the shell adjacent the lower end is provided with an annular bead 18 through which a thimble 19 protrudes, said thimblehaving an exteriorly threaded enlargement 20 at its lower end which abuts against the shoulder formed by the bead 18, the threaded enlargement 20 being engaged with the interior threads 14. A'threaded stem 21 having a kerfed head 22 is threaded through a centrally threaded opening 23 in the thimble, the head 22 lying in.a central recess 24 atthe under side of the thimble. The stem 21 extends upwardly through and snugly fits a sleeve 25 of insulating material. The stem further extends and engages within the threaded central opening 26 of the cap and protrudes therebeyond where it is provided with longitudinal cross slits 27 dividing its upper end into a plurality of gripping jaws. The extreme terminal of the stem is of conical formation as at 28 with which the conical bore 29 of an adjusting nut 30 engages, said nut being internally threaded and engageable over theprotruding extremity of the jaws. A plurality of washers 31 of insulating material are disposed immediatelybelow'the closure cap 17 and bear against the end of the sleeve,

25. Intermediate Washers 32 of insulating material surround the sleeve 25 and divide the space defined between the sleeveand the shell 10 into compartments.- Suitable powdered insulating material 33 is arranged insaid compartments, said material being prefe'rably formed of ground mica. The closure cap 17 and thimble 19 are preferably constructed of an insulating material and the f' thimble is provided an outwardly flared portion 34 at the outer end of the recess 24 which ortion constitutes a seat. The

- jaws formed at the outer end of the stem outer threads 37 engaging the inner threads 14 of the extension. An insulating element 39is threaded into the internal threads 38 of the element 36 and the insulating element isprovided with an enlarged head 40 at its upper end which is provided with a conical portion 41 adapted to seat against the flared portion or seat 34 of the thimble 19. An'electrode consisting of a threaded rod 42 having a spherical terminal 43 is threaded through the insulating element 39 and is engaged against the head 22 of the stem 21, the spherical terminal 43 projecting through and below theouter end of the insulating member 39 and the closure ele- ',me11t 36. The closure element 36 iscprovided with an annular groove 44 and a ground electrode 45 of substantially U- shaped formation has one of its legs extending through an opening 46 which communicates with.the annular groove 44, the terminal of said leg being bent at an angle as at 47 to attach the ground electrode 45 to the closure element 36. The threads 38 of the closure element 36. and the threaded portion of the insulatin element 39 are provided with semicircu ar grooves 48 and 49 which when in registry are adapted to receive the terminal 50 of the other leg of the ground electrode 45 to lock the elements 36 and 39 together. When the element 36 is threaded into the extension 12, the conical portion 41 of'the insulating element 39'seats against the flared portion 34 of the thimble,

and simultaneously the inner end of the .stem 42 is brought into contact with the head 22 of the stem 21. Under this arrangement J the current will flow from the terminal wire 35 through the stem 21 the stem 42 tothe spherical terminal 43. In the event of breakage of any parts or units of the plug,

the same may be readily replaced by disassembling the same without incurring the expense entailed in discarding the -entire plug for a new one. The spark gap may be readily varied by unscrewing the stems 21 and 42 to advance the spherical terminal 43 toward the ground terminal 45.-

We claimi l. A spark plug comprising a shell havmg insulating material therein, non-conductor closure elements mounted in the opposite ends of the shell, an axially adjustable sulating "material and closure elements, a

the carrier member. L

and non-conductorportions adjustably and removably mounted in the lower end of the shell, said non-conductor portion abutting the lower closure element of the shell and said conductor portion engaging the shell, an electrode mounted through said carrier member having its upper end engaging the conductor stem, and a ground electrode of closure elements mounted in the opposite.

ends of the shell, an axially adjustable conductor stem mounted longitudinally through said shell and closure elements, said stem having its'upper end formi-ngan ignition terminal receiver, a carrier member having separable conductor and non-conductor portions adjustably mounted in the lower end of the shell, said non-conductor portion of the carrier member abutting the lower closure element of the shell, an electrode adjustably carriedrby said non-conductor portion adapted to contact the conductor stem between thelower closure element and nonconductor portion of the carrier member, and a ground electrode of .substantially -U- shape having one leg locked between the conductor and non-conductor portions of the carrier member and its other leg locked between the shell and conductor portion of 3. In a spark plug including a shell and conductor stem, a carrier member of separable conductor and non-conductor portions in the lower end of the shell, an electrode carried by the non-conductor portion of the carrier member for contact with the conductor stem, and a ground electrode of substantially U-shape' having oneleg locked between the conductor and non-conductor portions and the other leg locked between the conductor portion of the carrier member and the shell. A

4. A spark plug comprising a shell having an insulating sleeve therethrough, powdered insulating material mounted between said sleeve and shell, an axiallyadjustable conductor stem mounted through said sleeve having its upper end forming an ignition terminal receiver, closure elements for the shell, a carrier member of separable conductor and non-conductor portions mounted in the lower end of the shell, an electrode adjustably carried by said" non-conductor portion foreontact'with theconductor stem, and a ground electrode of substantially U- shape having one leg locked between the conductor and non-conductor portions and the other leg locked between the conductor portion of the carrier member and the shell. conductor "stem extending through said in- EUGENIO N. ALGOOER. FRANCISCO O.-ALOOCER. 

